ENP Alger Access Contest common mistakes
ENP Alger Access Contest · Understand the traps and how to avoid them.
Spending a fixed number of minutes per mathematics multiple-choice item regardless of difficulty, so easy items and hard items are budgeted identically and the last items are reached with no time left.
The contest is timed and candidates often rehearse with untimed practice, so they never build an internal clock or a triage rule; anxiety then pushes them to grind on one stubborn algebra or geometry item while cheap points expire.
What to do instead
Adopt an explicit two-pass rule: first pass, answer every item you can resolve in under roughly 90 seconds and mark the rest; second pass, return to marked items with the remaining time. In practice, run full timed mock papers and record per-item time to learn which item types are your slow ones, then drill only those.
Solving a physics problem by immediately substituting numbers into the first formula that looks relevant, without first writing the known quantities, the unknown, and the physical principle that links them.
School drilling rewards formula recall over modelling, and under time pressure the first familiar symbol string feels safer than a slower analysis; dimensional and sign errors then go unnoticed because no symbolic check was made.
What to do instead
Before any calculation, write a three-line setup: given (with units), required, and the principle (e.g. conservation of energy, Newton's second law, Ohm's law). Solve algebraically for the unknown first, check dimensions of the result, and only then insert numbers. Practise by re-deriving each formula you use from its principle at least once.
Ignoring units and unit conversions in physics items, mixing centimetres with metres, grams with kilograms, or minutes with seconds, and reporting an answer in whatever unit the calculation happened to produce.
Contest items deliberately embed non-SI units to test attention; candidates who work numerically lose track of scale, and since answer options are often numerically similar, a conversion slip produces a plausible-looking wrong choice rather than an obvious one.
What to do instead
Convert every given quantity to SI at the moment you write it down, before doing any arithmetic, and carry units through the algebra so they cancel visibly. As a final check, estimate the expected order of magnitude and reject any option that is off by powers of ten.
Balancing chemical equations by adjusting coefficients while ignoring charge balance in ionic and redox contexts, or balancing atoms only and never checking electron transfer.
Introductory courses emphasise atom counting, so the half-reaction and oxidation-number methods are under-practised; in redox items the atom-balanced but charge-unbalanced equation looks finished and matches a distractor.
What to do instead
For any reaction involving ions or oxidation states, use the half-reaction method explicitly: split, balance atoms other than O and H, balance O with water, balance H with protons (or hydroxide in basic medium), balance charge with electrons, then equalise electrons and add. Always finish by verifying both atom and total charge balance on each side.
Treating stoichiometry as a ratio problem on the given masses directly, without identifying the limiting reagent, and reporting the product amount from the reactant that is easier to compute.
Many textbook exercises supply a single reactant, so the limiting-reagent step is skipped in routine practice; when two reactants are given, the habit of using the first-listed one produces a wrong yield that is often among the options.
What to do instead
Always compute moles of every reactant, divide each by its stoichiometric coefficient, and identify the smallest quotient as the limiting reagent before computing any product. Write this as a fixed template and apply it even when only one reactant is given, so the step never gets skipped.
Answering biology items from everyday intuition or a single memorable example rather than from the stated mechanism, for instance assuming a trait is always dominant because it is common, or confusing correlation with causation in physiology scenarios.
Biology is vocabulary-dense and candidates memorise isolated facts without the underlying causal chain, so unfamiliar phrasing in an item breaks the link to the memorised fact and intuition fills the gap.
What to do instead
For each core topic, build a short causal chain (structure to function to consequence) rather than a list of terms, and practise explaining each chain aloud in two sentences. When an item presents data, restate the claim and the evidence separately before choosing, and eliminate any option that asserts causation from an association.
Misreading the question stem: answering the opposite of what is asked, ignoring 'except', 'least', 'not', or 'which of the following is false', and selecting a true statement when a false one was requested.
Under time pressure readers sample keywords rather than parse the sentence, and negative or superlative constructions are the easiest words to skip; the resulting error feels like a knowledge gap but is purely attentional.
What to do instead
Circle or underline the operative words in the stem (the quantifier, the negation, the target) before looking at options, and restate the task to yourself in your own words. For 'except' and 'false' items, deliberately mark each option T or F next to it and then select the odd one out.
In scientific reasoning items, accepting a conclusion because the data are consistent with it, without asking whether an alternative explanation or a confounder could produce the same data.
Candidates conflate confirmation with proof and are trained to look for the option that agrees with the passage; the correct answer in reasoning sections is usually the one that names the weakness, the assumption, or the alternative cause.
What to do instead
Use a fixed three-question routine on every passage: what is claimed, what evidence is offered, and what must be true for the evidence to support the claim. Then actively generate one rival explanation before reading the options, and prefer options that identify a specific assumption or confounder over general statements.
Leaving answers blank or changing correct answers at the last minute on the basis of a vague feeling, especially in the final minutes of the paper.
Negative marking rumours and fear of committing create blanks, while anxiety-driven second-guessing overrides a first answer that was reached by actual reasoning; both behaviours destroy expected score without adding information.
What to do instead
Establish the marking rule from the instructions before starting, and if there is no penalty, never leave an item blank: eliminate options and guess. For changes, adopt a rule that you only revise an answer when you can articulate a concrete reason (a misread word, a recalled fact, a recomputation), never on unease alone.
Skipping the final verification step: not substituting the computed answer back into the original equation or constraint, and not checking that the answer is physically or biologically plausible.
Time pressure and the relief of reaching a number cause candidates to move on immediately; extraneous roots, sign errors, and impossible values (negative mass, probability above one, concentration above solubility) then pass straight into the answer sheet.
What to do instead
Reserve a short verification block: substitute the answer back where feasible, check sign, magnitude, and units, and confirm the answer satisfies every constraint stated in the stem. Practise this until it is automatic by doing short sets where you are required to write one verification line per item, then drop the written line but keep the check.